lxc-usernsexec: setgroups() similar to other places shouldn't fail on EPERM

FAIL: lxc-tests: lxc-test-usernsexec (1s) --- as test-userns executing /tmp/autopkgtest.waGEXj/build.Hm3/src/src/tests/lxc-test-usernsexec uid=1001 gid=1001 name=test-userns subuid=165536 subgid=165536 ver=1:4.0.4-0ubuntu3 lxc-utils=1:4.0.4-0ubuntu3 kver=5.8.0-19-generic USERNSEXEC=lxc-usernsexec nouidgid: PASS myuidgid: FAIL - runtest failed 1 $ lxc-usernsexec -mu:0:1001:1 -mg:0:1001:1 -- /tmp/autopkgtest.waGEXj/build.Hm3/src/src/tests/lxc-test-usernsexec inside f0 lxc 20200914222824.562 ERROR utils - utils.c:lxc_setgroups:1363 - Operation not permitted - Failed to setgroups() kid 73112 is gone 1 subuidgid: PASS bothsets: PASS mismatch: PASS ERRORS: myuidgid --- Reported-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>

lxc-usernsexec: setgroups() similar to other places shouldn't fail on EPERM
5e433189 · Christian Brauner · 422820d5 · 5e433189
Unverified Commit 5e433189 authored Sep 17, 2020 by Christian Brauner
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lxc_usernsexec.c src/lxc/cmd/lxc_usernsexec.c +1 -1

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--- a/src/lxc/cmd/lxc_usernsexec.c
+++ b/src/lxc/cmd/lxc_usernsexec.c
@@ -88,7 +88,7 @@ static int do_child(void *vargv)
 	int ret;
 	char **argv = (char **)vargv;

-	if (!lxc_setgroups(0, NULL))
+	if (!lxc_setgroups(0, NULL) && errno != EPERM)
 		return -1;

 	/* Assume we want to become root */